a. York. A movable bridge over a shaft top upon which the bucket is placed
after it is brought up for emptying. Fay
b. A car used on mine tramways, or at coke ovens. Fay
c. Gr. Brit. A long wagon having a very low platform and four very small
wheels. Standard, 2
Los Angeles abrasion testing machine
A machine for measuring abrasion resistance or toughness. It consists of a
closed hollow steel cylinder 28 in (71.12 cm) in diameter and 20 in (50.8
cm) long mounted for rotation with its axis horizontal. The sample being
tested and a charge of steel spheres are tumbled during rotation by an
internal shelf. AIME, 1
a. Eng. To work a seam of coal, etc., up to where it dies out or is
faulted out of sight. This is called "losing the coal." Fay
b. To be unable to work out a pillar on account of thrust, creep, gob
fire, etc. Fay
c. A pit shaft is said to be "lost" when it has run in or collapsed beyond
recovery. Fay
A monoclinic mineral, (Mn,Zn)7 (CO3 )2 (OH)10;
soft; bluish white; at Franklin, NJ.
Difference between weight of raw coal and that of salable products,
expressed as a percentage. Pryor, 3
As applied to chemical analyses, the loss in weight that results from
heating a sample of material to a high temperature, after preliminary
drying at a temperature just above the boiling point of water. The loss in
weight upon drying is called free moisture; that which occurs above the
boiling point of water, loss on ignition. Harbison-Walker
The condition during rotary drilling when the drilling mud escapes into
porous, fractured, or cavernous rocks penetrated by the borehole and does
not return to the surface. AGI
The amount of closure of the walls of a stope that occurs before supports
have been placed and begin to oppose that closure. Spalding
The portion of a core that is not recovered. It may be the soft rock that
crumbles and falls from the core barrel or the solid piece or pieces of
core that drop to the bottom of a borehole after slipping out of the core
barrel while the drill string is being pulled from the drill hole.
Long
A corner whose position cannot be determined, beyond reasonable doubt,
either from traces of the monument, or by reliable testimony relating to
it; and whose location can be restored only by surveying methods and with
reference to interdependent existent corners, by mutual agreement of
abutters, or by court decision. Seelye, 2
A borehole in which the target could not be reached because of caving,
squeezing, loose ground, or inability to recover lost tools or junk.
Long
Corn. A level or gallery driven with an unnecessarily great departure from
the horizontal. Fay
a. A dried-up river in an arid region.
b. A river in a karst region that drains into an underground channel.
See:string survey
See:lost circulation
An intrinsically safe public address system developed for coal face
communications. Up to 20 individual units, each containing a telephone
handset and speaker, can be coupled together along the face and gate roads
by a five-way cable. Instructions, requests, etc., made into any one of
the handsets are broadcast simultaneously over all the loudspeakers.
See also:signaling system
The pasty mass of iron produced in a bloomery or puddling furnace.
CF:looping
Any small magnifying glass or lens mounted for use in the hand, held in
the eye socket, or attached to spectacles and used to study minerals and
rocks. Also spelled lupe, loup, loop.
In ore dressing, smelting, and refining, one who trims carbon anodes and
cleans louvers to minimize electrical resistance in magnesium refining
cells. DOT
Overlapping and sloping slats arranged to prevent entrance or exit of a
portion of an air stream. Louvers are sometimes used as a regulator in
place of a sliding or other adjustable door.